1. Mix the hazelnuts and milk in a pan and bring to the boil.  Cook for 5 minutes, by which time some of the milk will have evaporated.
2. Remove from the heat, add the powdered milk, hazelnut oil and blend to form a smooth and even mixture.
   
3. Break the chocolate into squares and put straight into the mixture.  After 2 minutes it will have melted and you will be able to beat the mixture with a wooden spoon till smooth.
   
4. Keep in a sealed pot in a cool place.
   

See Turtle cake recipe.